$$R=\{x:x\text{ is an integer and}\hspace{0.5em}x^2=9\},$$\[S=\{x:x\text{ is a positive integer and}

Question

$$R=\{x:x\text{ is an integer and}\hspace{0.5em}x^2=9\},$$$$S=\{x:x\text{ is a positive integer and}\hspace{0.5em}4<x<5\}.$$ List the elements of $R$. State $S$ and $n(S)$. Explain why $S\neq\{0\}$.

Accepted Answer

(a) $\{-3,3\}$ (b) $S=\varnothing,\ n(S)=0$ (c) $\{0\}$ contains one element

Sets

Sets

Solution:

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